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Open AccessHypothesis

RNA Back and Forth: Looking through Ribozyme and Viroid Motifs

Sorbonne Université, Museum National d’Histoire Naturelle, CNRS MNHN UMR 7205, Institut de Systématique, Evolution, Biodiversité, ISYEB, F-75005 Paris, France
Institute for Integrative Biology of the Cell (I2BC), CNRS, CEA, Université Paris Sud, F-91198 Gif-sur-Yvette, France
Institut de Biologie Structurale CNRS-CEA-UGA, F-380447 Grenoble, France, and Institut Laue Langevin, 71 Avenue des Martyrs, F-38042 Grenoble, France
Authors to whom correspondence should be addressed.
Viruses 2019, 11(3), 283;
Received: 27 February 2019 / Revised: 14 March 2019 / Accepted: 18 March 2019 / Published: 21 March 2019
(This article belongs to the Special Issue Viroid-2018: International Conference on Viroids and Viroid-Like RNAs)
Current cellular facts allow us to follow the link from chemical to biochemical metabolites, from the ancient to the modern world. In this context, the “RNA world” hypothesis proposes that early in the evolution of life, the ribozyme was responsible for the storage and transfer of genetic information and for the catalysis of biochemical reactions. Accordingly, the hammerhead ribozyme (HHR) and the hairpin ribozyme belong to a family of endonucleolytic RNAs performing self-cleavage that might occur during replication. Furthermore, regarding the widespread occurrence of HHRs in several genomes of modern organisms (from mammals to small parasites and elsewhere), these small ribozymes have been regarded as living fossils of a primitive RNA world. They fold into 3D structures that generally require long-range intramolecular interactions to adopt the catalytically active conformation under specific physicochemical conditions. By studying viroids as plausible remains of ancient RNA, we recently demonstrated that they replicate in non-specific hosts, emphasizing their adaptability to different environments, which enhanced their survival probability over the ages. All these results exemplify ubiquitous features of life. Those are the structural and functional versatility of small RNAs, ribozymes, and viroids, as well as their diversity and adaptability to various extreme conditions. All these traits must have originated in early life to generate novel RNA populations. View Full-Text
Keywords: RNA world; viroid; ribozyme; origins of life RNA world; viroid; ribozyme; origins of life
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MDPI and ACS Style

Maurel, M.-C.; Leclerc, F.; Vergne, J.; Zaccai, G. RNA Back and Forth: Looking through Ribozyme and Viroid Motifs. Viruses 2019, 11, 283.

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